669549 has 8 divisors (see below), whose sum is σ = 909792. Its totient is φ = 437840.

The previous prime is 669527. The next prime is 669551. The reversal of 669549 is 945966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669549 - 2¹¹ = 667501 is a prime.

669549 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669549.

It is not an unprimeable number, because it can be changed into a prime (669049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1947 + ... + 2264.

It is an arithmetic number, because the mean of its divisors is an integer number (113724).

2⁶⁶⁹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

669549 is a deficient number, since it is larger than the sum of its proper divisors (240243).

669549 is a wasteful number, since it uses less digits than its factorization.

669549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267.

The product of its digits is 58320, while the sum is 39.

The square root of 669549 is about 818.2597387138. The cubic root of 669549 is about 87.4837629735.

The spelling of 669549 in words is "six hundred sixty-nine thousand, five hundred forty-nine".